Add features to test pattern 16

piet/src/samples/picture_16.rs

@@ -9,6 +9,7 @@ pub const SIZE: Size = Size::new(200., 200.);
 
 const RED: Color = Color::rgb8(255, 0, 0);
 const BLUE: Color = Color::rgb8(0, 0, 255);
+const GREEN: Color = Color::rgb8(0, 255, 0);
 const INTERPOLATION_MODE: InterpolationMode = InterpolationMode::NearestNeighbor;
 const BORDER_WIDTH: f64 = 4.0;
 
@@ -17,13 +18,17 @@ pub fn draw<R: RenderContext>(rc: &mut R) -> Result<(), Error> {
 
     let outer_rect_red = Rect::new(20., 20., 180., 180.);
     let inner_rect_blue = outer_rect_red.inset(-BORDER_WIDTH);
+    let inner_rect_green = Rect::new(25., 25., 150., 50.);
 
-    // Draw a box with a red border
+    // Draw boxes
     rc.fill(outer_rect_red, &RED);
     rc.fill(inner_rect_blue, &BLUE);
+    rc.fill(inner_rect_green, &GREEN);
 
-    // Cache the box, clear the image and re-draw the box from the cache
-    let cache = rc.capture_image_area(outer_rect_red).unwrap();
+    // Cache the image, clear the context and re-draw the box from the cache
+    let cache = rc
+        .capture_image_area(Rect::from_origin_size(kurbo::Point::ZERO, SIZE))
+        .unwrap();
     rc.clear(None, Color::BLACK);
     rc.draw_image(&cache, outer_rect_red, INTERPOLATION_MODE);
 
@@ -38,5 +43,45 @@ pub fn draw<R: RenderContext>(rc: &mut R) -> Result<(), Error> {
     rc.draw_image(&cache, bottom_left_corner, INTERPOLATION_MODE);
     rc.draw_image(&cache, bottom_right_corner, INTERPOLATION_MODE);
 
+    // Capture the top left corner and redrew it inset diagonally towards the center of the image
+    let corner_tl_rect = Rect::from_origin_size((0., 0.), (50., 50.));
+    let corner_tl_cache = rc.capture_image_area(corner_tl_rect).unwrap();
+    let corner_tl_cachedraw_rect = Rect::from_origin_size((50., 50.), (50., 50.));
+    rc.draw_image(
+        &corner_tl_cache,
+        corner_tl_cachedraw_rect,
+        INTERPOLATION_MODE,
+    );
+
+    // Capture the top right corner and redrew it inset diagonally towards the center of the image
+    let corner_tr_rect = Rect::from_origin_size((150., 0.), (50., 50.));
+    let corner_tr_cache = rc.capture_image_area(corner_tr_rect).unwrap();
+    let corner_tr_cachedraw_rect = Rect::from_origin_size((100., 50.), (50., 50.));
+    rc.draw_image(
+        &corner_tr_cache,
+        corner_tr_cachedraw_rect,
+        INTERPOLATION_MODE,
+    );
+
+    // Capture the bottom left corner and redrew it inset diagonally towards the center of the image
+    let corner_bl_rect = Rect::from_origin_size((0., 150.), (50., 50.));
+    let corner_bl_cache = rc.capture_image_area(corner_bl_rect).unwrap();
+    let corner_bl_cachedraw_rect = Rect::from_origin_size((50., 100.), (50., 50.));
+    rc.draw_image(
+        &corner_bl_cache,
+        corner_bl_cachedraw_rect,
+        INTERPOLATION_MODE,
+    );
+
+    // Capture the bottom right corner and redrew it inset diagonally towards the center of the image
+    let corner_br_rect = Rect::from_origin_size((150., 150.), (50., 50.));
+    let corner_br_cache = rc.capture_image_area(corner_br_rect).unwrap();
+    let corner_br_cachedraw_rect = Rect::from_origin_size((100., 100.), (50., 50.));
+    rc.draw_image(
+        &corner_br_cache,
+        corner_br_cachedraw_rect,
+        INTERPOLATION_MODE,
+    );
+
     Ok(())
 }